"We just missed getting them the first day by a few minutes," says Letterman.

Whoever is behind the Twitter handle posts clues as to where the tickets can be found.

"I've lived in Springfield my whole life and there's a sense of satisfaction you can get from seeing a picture and being like, 'I know where that is and I don't know that anyone else knows where that is as quickly as I do.'"

After striking out their first try, Letterman and his wife were able to snag four free tickets Saturday. They were found behind the Mediacom Ice Park sign.

"We were driving around and the notifications came to our phones," says Letterman. "And we were on Glenstone and recognized where it was and we were able to get here quickly."

According to the Hidden Tix Twitter account, the idea came from places doing this with hidden cash. While it may not be money these people are finding, to Springfield Cardinals fans, this is just as good.